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Thread: Top Loading MK15 Scrubber

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    Supporting Member Sandy is on a distinguished road Sandy is on a distinguished road Sandy's Avatar
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    Top Loading MK15 Scrubber

    Further to the last thread on this forum (holes in scrubber etc)I've started this as I should have. A MK15 scrubber design thread.

    I'm building a prototype of a MK15 scrubber that can be filled easily from the top. As a side bonus if you wanted to do a short dive you could also give it a part fill.

    It's based on the Scrubber I built for Marc (see MK15/BMR500 hybrid). His can be filled and packed in about 5 min.

    Here's my work in progress.

    Scrubber open with underside of lid. Note the inside of the scrubber has all the raised standoffs to put a Porex membrane against. I have stainless steel mesh I'll use for testing because I'm sure my test pilot does not want me to steal the porex from his scrubber and trim it to fit just yet. The scrubber will get a final coat of epoxy to seal it all up. The white haze color is from final machining and sanding. both open.jpg

    Here is the lid from the top. I've emulated the little smarties that keep the foam pad off the top of the scrubber.
    Lid top.jpg

    Here is a view of the base of the scrubber. After the last short discussion on the hole layout I've used the stock layout and enlarged the holes slightly. (very little - 7/16ths inch up to half inch (8/16ths)or thereabouts). The lid is held down with 4 stainless steel bolts that have short thumbwheel nuts to clamp it all down. I will start with a foam insert under the lid against the sorb and under the stainless mesh to give the scrubber media a little bit of compression. To clarify the scrubber when packed will be comprised of:
    1.stainless steel mesh inside at the bottom to hold the absorbent off the base of the scrubber.
    2. Absorbent
    3. Compressible foam layer
    4. Stainless steel mesh to hold absorbent off the lid
    5.Lid in place tightened down with brass thumbwheel nuts.
    Under scbr.jpg

    You can see the step in the center where the o-ring seals and the sensor bay narrows slightly.

    I would love to try an external o-ring seal to do away with the rubber band but that may have to do with V2.5 or somewhere down the line like that.

    I'm open to comments, concerns and guidance. I would like to do a production run once this has been tweaked and if there is interest.

    Cheers,
    Sandy

  2. #2
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    Quote Originally Posted by Sandy  View Original Post
    Further to the last thread on this forum (holes in scrubber etc)I've started this as I should have. A MK15 scrubber design thread.

    I'm building a prototype of a MK15 scrubber that can be filled easily from the top. As a side bonus if you wanted to do a short dive you could also give it a part fill.

    It's based on the Scrubber I built for Marc (see MK15/BMR500 hybrid). His can be filled and packed in about 5 min.

    Here's my work in progress.

    Scrubber open with underside of lid. Note the inside of the scrubber has all the raised standoffs to put a Porex membrane against. I have stainless steel mesh I'll use for testing because I'm sure my test pilot does not want me to steal the porex from his scrubber and trim it to fit just yet. The scrubber will get a final coat of epoxy to seal it all up. The white haze color is from final machining and sanding. Attachment 26959

    Here is the lid from the top. I've emulated the little smarties that keep the foam pad off the top of the scrubber.
    Attachment 26960

    Here is a view of the base of the scrubber. After the last short discussion on the hole layout I've used the stock layout and enlarged the holes slightly. (very little - 7/16ths inch up to half inch (8/16ths)or thereabouts). The lid is held down with 4 stainless steel bolts that have short thumbwheel nuts to clamp it all down. I will start with a foam insert under the lid against the sorb and under the stainless mesh to give the scrubber media a little bit of compression. To clarify the scrubber when packed will be comprised of:
    1.stainless steel mesh inside at the bottom to hold the absorbent off the base of the scrubber.
    2. Absorbent
    3. Compressible foam layer
    4. Stainless steel mesh to hold absorbent off the lid
    5.Lid in place tightened down with brass thumbwheel nuts.
    Attachment 26961

    You can see the step in the center where the o-ring seals and the sensor bay narrows slightly.

    I would love to try an external o-ring seal to do away with the rubber band but that may have to do with V2.5 or somewhere down the line like that.

    I'm open to comments, concerns and guidance. I would like to do a production run once this has been tweaked and if there is interest.

    Cheers,
    Sandy

    Very, very interesting. Seems more than just a little bit remenisicent of a 15.5 scrubber. Will watch development with hopes for success!



    Sent from my BNTV250 using Tapatalk

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    RBW Member whynot? will become famous soon enough whynot? will become famous soon enough whynot? will become famous soon enough whynot? will become famous soon enough whynot?'s Avatar
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    Re: Top Loading MK15 Scrubber

    Very nice Sandy. I'll definitely keep an eye on this with great hopes for your success. As far as I know, I'm the only diver with a hybrid unit (15 lower 15.5 upper- Billy Deans old rig) so if you want pictures or info PM me with your email and I'd be happy to send some beta over. I've been working on it for an upcoming dive expedition so it will be easy to take pictures for you.

    -Kevin

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    RBW Member S. Marc is a jewel in the rough S. Marc is a jewel in the rough S. Marc is a jewel in the rough S. Marc is a jewel in the rough S. Marc is a jewel in the rough S. Marc is a jewel in the rough S. Marc is a jewel in the rough S. Marc's Avatar
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    Re: Top Loading MK15 Scrubber

    I would add that pictures do not to justice to to the level of craftsmanship Sandy has.

    His work in composites and carbon fibre is professional grade and flawless.

    S. Marc

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    Re: Top Loading MK15 Scrubber

    Hi Sandy

    Looks good

    I have a question/concern. Materials in a scrubber ought to be suitable for food.
    Also in case some amount of caustic water be present. What is your thought on that ?

    I know that properly mixed and cured epoxy is supposed to be edible, though hard to chew

    Best regards

    Bo

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    Re: Top Loading MK15 Scrubber

    Very very nice. Count me in for one.

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    Re: Top Loading MK15 Scrubber

    Nice work! Looks a lot like a 15.5/16 scrubber. I'd be careful about using it without the porex though. Obviously the porex distributes the gas over the entire scrubber bed, so trying without it could lead to very premature breakthrough. Also, on the 15.5 top, they designed "wings" to keep the sponge away from the top of the dome and also use a screen. The 15 has the sponge attached to the dome. For this application, I would probably use the standard 15 sponge attached to the inside of the top of the dome rather than a sponge like the 15.5.

    Again, looks very promising.

    Aloha,
    Charlie

  8. #8
    Supporting Member Sandy is on a distinguished road Sandy is on a distinguished road Sandy's Avatar
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    Re: Top Loading MK15 Scrubber

    I've got the prototype finished and out for testing. Epoxy is full foodsafe and stable. There should be no issues with it. (polyester resin is used a lot for fiberglass and is nasty toxic and offgasses forever. Plus it stinks. Not what I use)

    The stainless steel mesh is in place at the bottom and top to do the same job as the Porex in keeping the scrubber bed off the base and top of the scrubber. (no hydrophobic value though) The base of the inside of the scrubber and underside of the lid have small raised ribs which keep the mesh a few millimeters off the side and allow the entire sides of the scrubber media to inflow and outflow gas.

    Here you can see the scrubber open to the inside. The mesh is in place at the bottom and the lid is beside with the top layer of mesh.
    insid open.jpg

    The scrubber here is empty but you can see the fit of the mesh. Its really stiff stainless screen and is quite hard to bend or flex.top scrim.jpg

    This is the top view of the assembled scrubber.
    top assmbld.jpg

    Bottom Viewbotm assmbld.jpg

    And a final picture of it in the MK15.
    Its a nice fit on the sensor bay and the retaining ring fits perfect in the center as well.in place.jpg

    I'll have my buddy post some comments after he's done some trials.

    Sandy

  9. #9
    Dive different. cys has much to be proud of cys has much to be proud of cys has much to be proud of cys has much to be proud of cys has much to be proud of cys has much to be proud of cys has much to be proud of cys has much to be proud of cys has much to be proud of cys has much to be proud of cys has much to be proud of cys's Avatar
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    Re: Top Loading MK15 Scrubber

    Awesome. I need one...

    The fact that the lid can recess means it should be even easier to pack than a 15.5 scrubber...

  10. #10
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    Re: Top Loading MK15 Scrubber

    Doesn't the rim need to be sealed? Would this not be problematic?

    Please forgive my ignorance if I am wrong.

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